Urology and Nephrology (E1) Flashcards
How much CO do the kidneys take?
25%
What percentage of water is reabsorbed at the proximal tubules?
65%
Which hormones work at the distal tubules? Where is it produced? What is it’s function?
Aldosterone
- Adrenal cortex
- Reabsorb sodium, excretes potassium to increase blood pressure
ADH (vasopressin) [also works in collecting duct]
- Pituitary gland
- Opens aquaporins to bring water back into circulation, concentrating urine
What does the juxtaglomerular apparatus measure?
Blood pressure
Which hormones are produced in the kidney? What are their functions?
EPO
-RBC production (bone marrow)
1,25 Dihydroxycholecalciferol (Calcitriol)
-active form of vitamin D
Renin
-Converts Angiotensinogen to Angiotensin I (liver, RAAS)
What function does PTH have on the kidneys?
Signals kidneys to excrete phosphorous and reabsorb calcium to increase [calcium] in the body
What are the causes of pre-renal azotemia?
Dehydration Hypoadrenocorticism Cardiac disease Hypovolemia Shock
(Perfusion problems)
What are the causes of renal azotemia?
Parenchymal disease Infections Cysts Inflammation Neoplasia Toxins
What are the causes of post-renal azotemia?
Blockage - urethral/bladder or just urethral
Obstruction
T/F Azotemia occurs when renal disease is present.
False, it indicates renal FAILURE
What are the 4 things that occur in cases of uremia?
Azotemia
Hypoalbuminemia
Hypercholesterolemia
Metabolic acidosis
What are accurate techniques for determining GFR?
GOLD STANDARD- Renal scintigraphy (radioisotopes)
Iohexal/Inulin/ creatinine clearance tests
Why does GIT bleeding, intravascular hemolysis and high protein diets cause false positives when using urea to measure GFR?
Causes liver to produce more urea
T/F: Creatinine is a better indicator for GFR than urea.
True
What polypeptide protease inhibitor is produced by all nucleated cells is used to measure GFR?
Cystatin C
What combination of tests is usually used to assess the kidneys?
SDMA
Creatinine
Complete urinalysis
Protein, pH, ketones, blood and which other value is useful when analyzing a urine dipstick?
Glucose
What is the normal reference range for a dog’s urine specific gravity? A cat?
Dogs >1.030
Cats >1.035
What are the 2 first choice antibiotics to treat a UTI?
Cephalosporins
Amoxi-Clav
What disease must be ruled out before performing a partial water deprivation test? What is this test for?
Cushing’s
Diabetes insipitus vs psychogenic polydipsia
If the specific gravity of urine increases when you give desmopressin, which type of DI is present?
Central
What type of azotemia is present if the fractional Na excretion is <1%?
Pre-renal
Why is it better to perform a urinalysis in house?
Storage causes crystal growth and the disintegration of casts and cells.
Why would you get a false positive UPC when a UTI is present?
Bacteria contain protein